Yamaha F150A - Page 351

8-44
Shimming (regular rotation model)
0
1
2
3
4
5
6
7
8
9
10
A
A. Backlash measurement (BL2)
B. Shim thickness adjustment
4. Calculate the new reverse gear shim (T2)
thickness.
TIP:
• Use the lowest number of shims to obtain
the required shim thickness.
• If the calculated shim thickness cannot be
obtained with a combination of the available
shims, increase or decrease the shim thick-
ness by 0.01 mm.
Calculation formula:
New reverse gear shim (T2) thickness =
Current reverse gear shim thickness + shim
thickness adjustment
Example:
Use the following formula when the shim
thickness adjustment value is positive.
Current reverse gear shim thickness =
0.62 mm
Shim thickness adjustment = 0.14 mm
New reverse gear shim (T2) thickness =
0.62 mm + 0.14 mm
= 0.76 mm
Use the following formula when the shim
thickness adjustment value is negative.
Current reverse gear shim thickness =
0.62 mm
Shim thickness adjustment = –0.21 mm
New reverse gear shim (T2) thickness =
0.62 mm + (–0.21 mm) = 0.41 mm
5. Install the determined reverse gear shims
(T2) and propeller shaft housing assem-
bly.
0 5 10 A
0.34 0.30 0.2
7
B
0.10
0
–0.10
–0.20
–0.30
–0.40
0 5 10
B (mm)
A (1/100 mm)
6
5 70 75 80 85
0.10 –0.14 –0.17 –0.21 –0.2
4
6
5 70 75 80 85
a
b
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40,
0.50 mm